Press fitting assembly and welding device

Abstract

The utility model discloses a press fitting assembly and a welding device. The press-fitting assembly comprises a base and a welding protection disc. The base is used for placing a battery cell, the welding protection disc is used for pressing the current collecting disc on the top of the battery cell, and the welding protection disc is provided with a first flow channel, a second flow channel and a laser channel. The laser channel is used for allowing laser to enter and irradiate the flow collecting disc. An air outlet of the first flow channel is a first air outlet, and the first air outlet is located in the inner wall face of the laser channel. An air inlet of the second flow channel is a second air inlet, an air outlet of the second flow channel is a second air outlet, the second air inlet is located in the inner wall face of the laser channel, and the second air outlet is used for being connected with first air extraction equipment. According to the welding protection disc, air enters from the laser channel penetrating through the welding protection disc, the first air outlet is formed in the inner wall face of the laser channel, protection gas directly falls on the flow collecting disc for protection after coming out of the first air outlet, interference between the protection gas and the air is reduced through the arrangement, and the welding quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of welding processing, in particular to a press-fit assembly and a welding device. Background Art

[0002] During the welding process of the collector plate, it is necessary to introduce a shielding gas into the collector plate for welding protection, and it is necessary to exhaust the gas at the same time to remove the smoke and dust generated by welding. In the traditional collector plate welding device, the flow field of the shielding gas and the flow field of the extracted gas interfere with each other, so that the shielding gas cannot protect the welding surface well, the welding protection effect is poor, and the welding quality and welding safety of the collector plate and the battery cell are affected. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a press-fit assembly that can reduce the interference between protective gas and air.

[0004] The utility model also provides a welding device with the press-fit assembly.

[0005] The press-fit assembly according to the first embodiment of the utility model includes: a base and a welding protection plate. The base is used to place the battery cell, the welding protection plate is located above the base, the welding protection plate is used to press the current collecting plate on the top of the battery cell, and the welding protection plate is provided with a first flow channel, a second flow channel and a laser channel. The laser channel passes through the welding protection plate in the vertical direction, the bottom end of the laser channel is used to be covered by the current collecting plate, and the laser channel is used to allow the laser to enter and irradiate the current collecting plate. The first flow channel is used to pass the protective gas for protecting the welding of the current collecting plate, the air inlet of the first flow channel is the first air inlet, the air outlet of the first flow channel is the first air outlet, the first air inlet is located outside the laser channel, and the first air outlet is located on the inner wall surface of the laser channel. The air inlet of the second flow channel is the second air inlet, the air outlet of the second flow channel is the second air outlet, the second air inlet is located on the inner wall surface of the laser channel, the second air outlet is located outside the laser channel, the second air outlet is used to connect with the first exhaust device, and the first air outlet and the second air inlet are arranged opposite to each other.

[0006] According to the press-fit assembly of the embodiment of the utility model, at least the following beneficial effects are achieved: the shielding gas flows out from the first air outlet and enters the laser channel, thereby protecting the collecting plate; the air enters from the laser channel that passes through the welding shielding plate, and then mixes with the shielding gas and the dust generated by welding before entering the second air inlet and being drawn away; the first air outlet and the second air inlet are both arranged on the inner wall surface of the laser channel and facing each other, thereby improving the consistency of the gas flow direction of the first air outlet and the second air inlet; such an arrangement reduces the interference between the shielding gas and the air, thereby improving the welding quality.

[0007] According to some embodiments of the present invention, a plurality of laser channels are provided, and the plurality of laser channels are evenly distributed around the center of the current collecting disk.

[0008] According to some embodiments of the present invention, the first air outlet is arranged on the inner wall surface of one end of the laser channel close to the center of the collecting disk, and the second air inlet is arranged on the inner wall surface of one end of the laser channel away from the center of the collecting disk.

[0009] According to some embodiments of the utility model, the welding protection plate further includes a circular positioning groove, the bottom end of the laser channel is connected to the positioning groove, and the positioning groove is used to position the battery cell.

[0010] According to some embodiments of the utility model, the welding protection plate is also provided with a third flow channel, the air inlet of the third flow channel is the third air inlet, the air outlet of the third flow channel is the third air outlet, the third air inlet is arranged downward, the third air inlet and the bottom end of the laser channel are located on the same plane, the third air outlet is used to be connected to the second exhaust device, and the second exhaust device is used to vacuum the third flow channel so that the third air inlet adsorbs the collecting plate.

[0011] According to some embodiments of the present invention, the inner wall surface of the first flow channel includes an inclined surface, the inclined surface extends to the first air outlet, and the inclined surface is inclined downward.

[0012] According to some embodiments of the utility model, the press-fitting assembly includes a clamp, which is installed on a base and located below the welding protection plate. The clamp includes a clamp and a clamping cylinder, and the clamping cylinder is used to drive the clamp to open and close. When the clamp is in a closed state, the clamp clamps the outer peripheral surface of the battery cell.

[0013] According to some embodiments of the present invention, the press-fitting assembly includes a lifting mechanism, which is connected to the clamper and is used to drive the clamper to move in a vertical direction.

[0014] A welding device according to an embodiment of the second aspect of the utility model comprises a press-fit assembly according to any one of the embodiments of the first aspect.

[0015] The welding device according to the embodiment of the utility model has at least the following beneficial effects: in the press-fit assembly, air enters from the laser channel that passes through the welding protection plate, and is then extracted from the second air inlet, and the protective gas flows out from the first air outlet, and the first air outlet and the second air inlet are both arranged on the inner wall surface of the laser channel and arranged opposite to each other, thereby improving the consistency of the gas flow direction of the first air outlet and the second air inlet. Such an arrangement reduces the interference between the protective gas and the air, and thus improves the welding quality of the welding device using the press-fit assembly.

[0016] According to some embodiments of the utility model, the welding device further includes: a laser collimator, which is used to adjust the laser. The laser collimator is located above the welding protection plate. The laser passes through the laser collimator and enters and irradiates the collecting plate.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 A three-dimensional diagram of a press-fit assembly according to an embodiment of the first aspect of the present utility model;

[0020] Figure 2 A three-dimensional diagram of a welded protective plate of a press-fit assembly according to some embodiments of the present invention;

[0021] Figure 3 for Figure 2 A top view of the middle welding protection plate;

[0022] Figure 4 for Figure 3 A cross-sectional view of the middle welding protection plate;

[0023] Figure 5 for Figure 2 The first exploded view of the welding protection plate;

[0024] Figure 6 for Figure 2 A second exploded view of the welded protection plate;

[0025] Figure 7 It is a three-dimensional diagram of a welding device according to an embodiment of the second aspect of the utility model.

[0026] Reference numerals: press-fit assembly 100, welding protection plate 101, base 102, battery cell 103, clamp 104, clamping cylinder 105, clamping claw 106, lifting mechanism 107, laser channel 201, first air inlet 202, first air outlet 203, second air outlet 204, third air outlet 205, inclined surface 206, second air inlet 401, third air inlet 402, collecting plate 403, positioning groove 404, protective gas flow direction 405 , air flow direction 406, vacuum gas flow direction 407, first flow channel 408, second flow channel 409, third flow channel 410, upper plate 501, middle plate 502, lower plate 503, first fan-shaped through hole area 504, second fan-shaped through hole area 505, second hollow tube 506, extension part 507, groove 508, first hollow tube 601, welding device 700, laser collimator 701, galvanometer 702, field lens 703, reinforcing rib 704. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] refer to Figures 1 to 4 According to the first aspect of the present utility model, the press-fit assembly 100 includes: a base 102 and a welding protection plate 101. The base 102 is used to place the battery cell 103, and the welding protection plate 101 is located above the base 102. The welding protection plate 101 is used to press the current collecting plate 403 on the top of the battery cell 103. The welding protection plate 101 is provided with a first flow channel 408, a second flow channel 409 and a laser channel 201. The laser channel 201 passes through the welding protection plate 101 in the vertical direction, and the bottom end of the laser channel 201 is used to be covered by the current collecting plate 403. The laser channel 201 is used to allow the laser to enter and irradiate the current collecting plate 403. The first flow channel 408 is used to introduce the protective gas for protecting the welding of the collecting plate 403. The air inlet of the first flow channel 408 is the first air inlet 202, and the air outlet of the first flow channel 408 is the first air outlet 203. The first air inlet 202 is located outside the laser channel 201, and the first air outlet 203 is located on the inner wall of the laser channel 201. The air inlet of the second flow channel 409 is the second air inlet 401, and the air outlet of the second flow channel 409 is the second air outlet 204. The second air inlet 401 is located on the inner wall of the laser channel 201, and the second air outlet 204 is located outside the laser channel 201. The second air outlet 204 is used to connect with the first exhaust device, and the first air outlet 203 and the second air inlet 401 are arranged opposite to each other.

[0033] It should be noted that, in some embodiments of the present invention, the first air extraction device uses a vacuum pump, and a centrifuge, an air extractor and other devices may also be used.

[0034] In the prior art, the first air outlet 203 is set downward so that the protective gas is blown directly to the surface of the collecting plate 403; the second air inlet 401 is also set downward so that the dust on the surface of the collecting plate 403 is directly drawn upward, and in order to improve the welding quality and dust extraction quality, the first air outlet 203 and the second air inlet 401 are both set on the collecting plate 403 close to the welding point. However, such a setting will result in that after the protective gas is blown out from the first air outlet 203, a part of it will fall on the surface of the collecting plate 403 for protection, but a considerable part of it will be sucked away by the second air inlet 401 which is also set downward and relatively close.

[0035] However, in this scheme, reference Figure 4 , air enters from the laser channel 201 that passes through the welding protection disk 101, and then is extracted from the second air inlet 401, and the shielding gas flows out from the first air outlet 203, and the first air outlet 203 and the second air inlet 401 are both arranged on the inner wall surface of the laser channel 201 and are arranged opposite to each other, thereby improving the consistency of the gas flow direction of the first air outlet 203 and the second air inlet 401, and also increasing the distance between the first air outlet 203 and the second air inlet 401 as much as possible, and the shielding gas flows along the surface of the collecting disk 403 for protection. When the second air inlet 401 is exhausting and dust removal, the shielding gas that has flowed through the surface of the collecting disk 403 and the dust on the surface of the collecting disk 403 and the air at the laser channel 201 are extracted to prevent dust from overflowing, and will not affect the function of the shielding gas. Such an arrangement reduces the interference between the shielding gas and the air, and improves the welding quality.

[0036] It should be noted that in some embodiments of the present invention, the shielding gas used is nitrogen, which has stable chemical properties, can protect the welding area from being polluted by oxygen and water vapor in the atmosphere, and is more economical and practical. The shielding gas may also be carbon dioxide, argon or other inert gases.

[0037] refer to Figure 2 In some embodiments of the present invention, a plurality of laser channels 201 are provided, and the plurality of laser channels 201 are evenly distributed around the center of the collecting plate 403. Such an arrangement enables the shielding gas to evenly diffuse on the surface of the collecting plate 403 after flowing out from the first gas outlet 203, which helps to evenly cover the welding area and improve the welding quality.

[0038] It should be noted that in some embodiments of the present invention, three laser channels 201 are provided, which can ensure the uniformity of diffusion of the protective gas while reducing the difficulty of processing and the complexity of the process of the press-fit assembly 100. Four, six, etc. laser channels 201 can also be provided, and evenly distributed around the center of the collecting plate 403 to meet the use requirements of different scenarios.

[0039] refer to Figure 4 In some embodiments of the present invention, the first gas outlet 203 is disposed on the inner wall surface of one end of the laser channel 201 close to the center of the collecting disk 403, and the second gas inlet 401 is disposed on the inner wall surface of one end of the laser channel 201 away from the center of the collecting disk 403. This arrangement allows the protective gas to flow naturally from the center of the collecting disk 403 to a direction away from the center of the collecting disk 403 after flowing out from the first gas outlet 203, thereby covering the surface area of ​​the collecting disk 403 more comprehensively.

[0040] refer to Figure 4 and Figure 5 In some embodiments of the present invention, the welding protection plate 101 further includes a circular positioning groove 404, the bottom end of the laser channel 201 is connected to the positioning groove 404, and the positioning groove 404 is used to position the battery cell 103. The positioning groove 404 is conducive to the stability of the position of the battery cell 103 relative to the welding protection plate 101 when the battery cell 103 is in the processing position, improves the processing quality, and reduces the quality fluctuation of the batch battery cells 103 during processing.

[0041] It should be noted that the reference Figure 4 In some embodiments of the utility model, the inner periphery of the positioning groove 404 is also provided with a chamfer, and the chamfer approaches smoothly from bottom to top toward the center of the collecting plate 403. The chamfer can make the outer edge of the upper surface of the battery cell 103 touch the positioning groove 404 when being positioned, and slide smoothly to the final processing position, thereby avoiding the outer edge of the battery cell 103 from scratching the inner periphery of the positioning groove 404 during the positioning process, thereby causing wear on the surface of the battery cell 103.

[0042] refer to Figure 4 and Figure 5 In some embodiments of the utility model, the welding protection plate 101 is further provided with a third flow channel 410, the air inlet of the third flow channel 410 is the third air inlet 402, the air outlet of the third flow channel 410 is the third air outlet 205, the third air inlet 402 is arranged downward, the third air inlet 402 and the bottom end of the laser channel 201 are located on the same plane, and the third air outlet 205 is used to connect with the second exhaust device, and the second exhaust device is used to evacuate the third flow channel 410 so that the third air inlet 402 adsorbs the current collecting plate 403. The third air inlet 402 adsorbing the current collecting plate 403 is conducive to improving the position stability of the current collecting plate 403 during welding, thereby improving the stability of the welding process and the welding quality.

[0043] It should be noted that, in some embodiments of the present invention, the second air extraction device uses a vacuum pump, and a centrifuge, an air extractor and other devices may also be used.

[0044] It should be noted that in some embodiments of the present invention, the third air inlet 402 is arranged above the center of the collecting disk 403, and multiple laser channels 201 are evenly distributed around the third air inlet 402. This can improve the position stability of the collecting disk 403 during welding and make laser welding more uniform.

[0045] It should be noted that the reference Figure 5 and Figure 6In some embodiments of the present invention, three third flow channels 410 are evenly arranged around the center of the collecting plate 403, so that the adsorption force can be more evenly distributed on the surface of the collecting plate 403, and the flatness of the collecting plate 403 after adsorption can be improved. It can also be divided into four equal parts, six equal parts, or other distribution methods to meet the needs of different usage scenarios.

[0046] It should be noted that the reference Figure 5 and Figure 6 In some embodiments of the present invention, the welding protection plate 101 adopts a three-layer manufacturing process, the upper plate 501 is provided with a first air inlet 202, the middle plate 502 is provided with a third air inlet 402 and a third air outlet 205, and the lower plate 503 is provided with a second air outlet 204. The three layers are stacked to jointly define the laser channel 201, the first air outlet 203 and the second air inlet 401. Such an arrangement can make the structure of each flow channel clear, and the separate arrangement makes the manufacturing difficulty low.

[0047] Specifically, refer to Figure 5 and Figure 6 The upper plate 501 is provided with a first hollow tube 601, the upper end of the first hollow tube 601 is the first air inlet 202, and the lower end of the first hollow tube 601 is the first air outlet 203. At the same time, the lower end of the first hollow tube 601 forms the upper wall of the first air outlet 203. The upper plate 501 is provided with three first fan-shaped through hole areas 504 around the first hollow tube 601. The first fan-shaped through hole area 504 and the second fan-shaped through hole area 505 mentioned below are stacked and interconnected to form a laser channel 201, and the first fan-shaped through hole area serves as the upper part of the laser channel 201.

[0048] It should be noted that, in some embodiments of the present invention, the first hollow tube 601 is a throttle valve for adjusting the flow rate of the protective gas. The first hollow tube 601 may also be an adjusting component such as a pressure reducing valve.

[0049] Specifically, refer to Figure 5 and Figure 6 The middle plate 502 is provided with three second fan-shaped through hole areas 505, which serve as the lower section of the laser channel 201; the middle plate 502 is provided with three inclined surfaces 206, which form the lower wall surface of the first air outlet 203; the middle plate 502 has three extensions 507 extending outward, the extensions 507 are hollow, and the internal space of the extensions 507 serves as the third flow channel, and a through hole is provided inside the extensions 507 near the center of the middle plate 502, and the through hole is the third air inlet 402.

[0050] It should be noted that, in some embodiments of the present invention, the extension portion 507 is a quick-change connector for connecting to an air pipe of an external air circuit.

[0051] Specifically, refer to Figure 5 and Figure 6 The structure of the lower plate 503 is annular, and the lower plate 503 has three second hollow tubes 506. The end of the second hollow tube 506 close to the center of the lower plate 503 is the second air inlet 401, and the end of the second hollow tube 506 away from the center of the lower plate 503 is the second air outlet 204. Three grooves 508 are provided on the lower plate 503, and the grooves 508 are used to place the protruding part 507 of the middle plate 502.

[0052] Specifically, the middle plate 502 is placed in the lower plate 503, and then the upper plate 501 and the lower plate 503 are pressed together to fit the middle plate 502 and fixed by bolts. Figure 2 As shown, it should be noted that the fixing method is not limited to bolt fixing, and welding, bonding, clamping and the like can also be used.

[0053] The separate manufacturing of the third flow channel 410 can also prevent the third flow channel 410 from crosstalking with the other two flow channels during the vacuuming process, thereby improving the vacuuming effect.

[0054] refer to Figure 2 , Figure 4 and Figure 6 In some embodiments of the present invention, the inner wall surface of the first flow channel 408 includes an inclined surface 206, which extends to the first gas outlet 203 and is inclined downward. Such a configuration can guide the shielding gas downward, so that the shielding gas can more easily flow downward to the surface of the collecting plate 403 to play a protective role, and at the same time can reduce the interference between the shielding gas and the air.

[0055] refer to Figure 1 In some embodiments of the present invention, the press-fit assembly 100 includes a clamp 104, which is mounted on the base 102 and is located below the welding protection plate 101. The clamp 104 includes a clamp 106 and a clamping cylinder 105. The clamping cylinder 105 is used to drive the clamp 106 to open and close. When the clamp 106 is in a closed state, the clamp 106 clamps the outer peripheral surface of the battery cell 103. The clamp 104 can better fix the battery cell 103 and improve the stability of the processing process.

[0056] It should be noted that the reference Figure 1In some embodiments of the present invention, the clamping jaw 106 extends along the axial direction of the battery cell 103, and the length of the clamping jaw 106 is longer than 1 / 2 of the axial length of the battery cell 103, and the clamping surface of the clamping jaw 106 in contact with the battery cell 103 is arc-shaped. Such a setting can make the state of the battery cell 103 more stable during the process of the clamping jaw 106 clamping the battery cell 103, and the arc-shaped clamping surface design can also reduce the wear of the outer peripheral surface of the battery cell 103 during the clamping process.

[0057] refer to Figure 1 In some embodiments of the present invention, the press-fit assembly 100 includes a lifting mechanism 107, which is connected to the clamp 104 and is used to drive the clamp 104 to move in the vertical direction. The lifting mechanism 107 drives the clamp 104 to move so that the battery cell 103 can move in the vertical direction, so that the welding protection plate 101 can be better pressed on the top of the battery cell 103, and after the welding is completed, it is convenient to drive the clamp 104 to move so that the battery cell 103 moves downward, so as to take out the battery cell 103 and the current collecting plate 403, so as to better process the whole.

[0058] It should be noted that in some embodiments of the present invention, the lifting mechanism 107 is configured as a cylinder, which has a simple structure, a low failure rate, and a smooth lifting process. In some embodiments of the present invention, the lifting mechanism 107 is also provided with a pressure sensor, which is used to detect the pressure after the battery cell 103 and the welding protection plate 101 are pressed together to avoid damage to the battery cell 103 due to excessive pressure.

[0059] It should be noted that, in some embodiments of the present invention, the lifting mechanism 107 may also use a hydraulic cylinder, a screw module, a linear motor, an electromagnet, a belt module, etc., which are mechanisms for driving an object to move in a straight line.

[0060] refer to Figure 7 According to the second aspect of the present invention, the welding device 700 includes any one of the press-fit components 100 of the first aspect. In the press-fit component 100, air enters from the laser channel 201 that penetrates the welding protection plate 101, and the first gas outlet 203 is arranged on the inner wall surface of the laser channel 201, so that the shielding gas directly falls on the collecting plate 403 for protection after coming out of the first gas outlet 203. Such arrangement reduces the interference between the shielding gas and the air, improves the welding quality, and thus improves the welding quality of the welding device 700 using the press-fit component 100.

[0061] refer to Figure 1In some embodiments of the present invention, the welding device 700 further includes: a laser collimator 701, which is used to adjust the laser. The laser collimator 701 is located above the welding protection plate 101. The laser passes through the laser collimator 701 and enters and irradiates the current collecting plate 403. The laser collimator 701 can effectively improve the position accuracy of the laser used for welding processing and improve the processing quality.

[0062] It should be noted that the reference Figure 7 In some embodiments of the utility model, the welding device 700 further includes a galvanometer 702 and a field lens 703. After the laser passes through the laser collimator 701, it also passes through the galvanometer 702 and the field lens 703 before entering and irradiating the collecting plate 403. The galvanometer 702 can reflect the laser in different directions so that the laser can reach the desired position and improve the processing accuracy. The galvanometer 702 can also be used to adjust the power and shaping of the laser to optimize the processing effect. The field lens 703 is mainly used to focus the laser on a light spot so that the focal length does not change with the deflection angle, thereby ensuring that the laser can normally enter the specified focus and achieve the flatness of the focus and high-precision processing.

[0063] It should be noted that the reference Figure 7 In some embodiments of the present invention, the press-fit assembly 100 also includes a reinforcing rib 704, which is arranged on the surface of the press-fit assembly 100 opposite to the battery cell 103, which can improve the stability of the press-fit assembly 100, prevent the press-fit assembly from shaking when loading and unloading the battery cell 103 or during processing, and improve the processing quality.

[0064] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. Press-fit assembly, characterized in that, The press-fit assembly comprises: A base, the base is used to place the battery cell; A welding protection plate, the welding protection plate is located above the base, the welding protection plate is used to press the current collecting plate on the top of the battery core, and the welding protection plate is provided with a first flow channel, a second flow channel and a laser channel; The laser channel passes through the welding protection plate in the vertical direction, the bottom end of the laser channel is used to be covered by the current collecting plate, and the laser channel is used to allow the laser to enter and irradiate the current collecting plate; The first flow channel is used to introduce a protective gas for protecting the welding of the collecting plate, the air inlet of the first flow channel is a first air inlet, the air outlet of the first flow channel is a first air outlet, the first air inlet is located outside the laser channel, and the first air outlet is located on the inner wall surface of the laser channel; The air inlet of the second flow channel is the second air inlet, the air outlet of the second flow channel is the second air outlet, the second air inlet is located on the inner wall surface of the laser channel, the second air outlet is located outside the laser channel, the second air outlet is used to connect to the first air pumping device, and the first air outlet and the second air inlet are arranged opposite to each other.

2. The press-fit assembly according to claim 1, characterized in that: There are a plurality of laser channels, and the plurality of laser channels are evenly distributed around the center of the current collecting disk.

3. The press-fit assembly according to claim 2, characterized in that: The first air outlet is arranged on the inner wall surface of one end of the laser channel close to the center of the current collecting disk, and the second air inlet is arranged on the inner wall surface of one end of the laser channel away from the center of the current collecting disk.

4. The press-fit assembly according to claim 1, characterized in that: The welding protection plate further includes a circular positioning groove, the bottom end of the laser channel is connected to the positioning groove, and the positioning groove is used to position the top of the battery cell.

5. The press-fit assembly according to claim 1, characterized in that: The welding protection plate is also provided with a third flow channel, the air inlet of the third flow channel is the third air inlet, the air outlet of the third flow channel is the third air outlet, the third air inlet is arranged downward, the third air inlet and the bottom end of the laser channel are located on the same plane, the third air outlet is used to be connected to the second exhaust device, and the second exhaust device is used to vacuum the third flow channel so that the third air inlet adsorbs the collecting plate.

6. The press-fit assembly according to claim 1, characterized in that: The inner wall surface of the first flow channel includes an inclined surface, the inclined surface extends to the first air outlet, and the inclined surface is inclined downward.

7. The press-fit assembly according to claim 1, characterized in that: The press-fitting assembly includes a clamp, which is installed on the base and located below the welding protection plate. The clamp includes a clamp and a clamping cylinder, and the clamping cylinder is used to drive the clamp to open and close. When the clamp is in a closed state, the clamp clamps the outer peripheral surface of the battery core.

8. The press-fit assembly according to claim 7, characterized in that: The press-fitting assembly includes a lifting mechanism, which is connected to the clamper and is used to drive the clamper to move in a vertical direction.

9. A welding device, characterized in that The welding device comprises a press-fit assembly as claimed in any one of claims 1 to 8.

10. The welding device according to claim 9, characterized in that: The welding device also includes: A laser collimator is located above the welding protection plate, and the laser passes through the laser collimator and then irradiates the current collecting plate.

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